Stuck on Step5 (the same white screen with the spinning beach ball) I did everything the same except that I couldn't make USB from unishit anymore, moved this Yosemite.app to my portableHD right after I downloaded it back then. so instead I ran this command:
sudo /Volumes/portableHD/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/install_osx --applicationpath /Volumes/portableHD/Install\ OS\ X\ Yosemite.app --nointeraction
the USB (/Volumes/install_osx) has only 1 partition (tried GPT/or MBR same white screen) with same way installing clover like you described boot0af.... (target clover install on that partition, nothing on the EFI partition) , 4 clover files , 2 kext, on usb boot go "option/SMBIOS/Board ID" and changed the id before boot. everything looks normal apple logo, and progress bar underneath it, and then the white screen. Just hangs there
Update#1: I managed getting the app store to re-download the Yosemite again, Not sure what version, I'm bet it's not 10.10.2 anymore. Anyway, create the disk with unishit, (Tried UEFI or Lagacy), all still the same, both will stuck on that same white screen with the ball, no matter what I do.
Update#2: I found the solution of this pesky "grey screen with bitch ball" at this thread
So to be short, I follow the their steps troubleshooting, and can stop anytime when it works